Cutting a paragraph in half does not automatically make it clear. Concise writing begins earlier, with the decision to carry one idea through and let the others wait.
Choose the thought first
Before drafting, name the thought you want a reader to leave with. If you cannot put it in a plain sentence, adding more paragraphs will usually make the piece longer, not sharper.
Give each sentence a job
A sentence might make the claim, show what it means, or introduce a useful complication. When two sentences do the same job, keep the one that says it more precisely.
Stop at the right moment
An ending does not need to recap every point or turn a modest idea into a grand lesson. It needs to leave the reader with something to think about. Write towards that point, then stop.